What does code U05C1 mean?

DTC codes / U05xx · Network communication / U05C1

U05C1Invalid Data Received From Active Radiator Air Flow Control Module A

U05C1 is a communication fault where the vehicle's main computers receive data from the active radiator air flow control module that does not match expected values or is missing critical information. The module itself may be powered and communicating, but the content of its messages is invalid, so the receiving module sets this code to flag a data integrity problem rather than a total loss of communication.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.